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    <title>Document</title>
    <script>
        // js 是编程语言是很强的逻辑性在里面，实现这个要求的思路
        // 1.我们需要一个临时变量
        // 给临时变量 temp
        var temp;//声明一个临时变量
        var apple1='青苹果';
        var apple2="红苹果";
        temp=apple1;
        apple1=apple2;
        apple2=temp;
        console.log(apple1);
        console.log(apple2);
    </script>
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